What is a Webquest?

I've been rather tied up lately. First, I've been working on the blog on Spanish and English literature. Second, finishing an online course about Moodle. Besides, I've become involved in an interesting project on this specific Webquest,How did women live in the Middle Ages ?.
My students from 1st Bachillerato and I will be working on it all this month long and as they don't know anything about Webquests, I've prepared this presentation for them and of course, for anyone who is interested in this useful "technique for Internet-based learning".